Novel method for vestibular evoked myogenic potentials: technique and reproducibility

Area of Science:

• Neuroscience
• Audiology
• Vestibular System

Background:

• Vestibular evoked myogenic potentials (VEMPs) assess otolith and vestibular nerve function.
• Consistent sternocleidomastoid muscle (SCM) contraction is crucial for accurate VEMP measurements.
• Variability in SCM contraction can affect VEMP latency and amplitude interpretation.

Purpose of the Study:

• To introduce and evaluate a novel chin-rest pressure feedback method for controlling SCM contraction during VEMP testing.
• To assess the reliability and feasibility of this new technique in normal-hearing subjects.

Main Methods:

• A prospective study involving 19 normal-hearing subjects.
• Utilized a pressure feedback device with a rubber bulb and gauge to monitor SCM contraction.
• Subjects maintained a target pressure of 120 mm Hg using neck flexors.

Main Results:

• The method demonstrated high test-retest reliability, with interclass correlation coefficients ranging from 0.8 to 0.97.
• No significant differences were found between right and left ear VEMP measurements.
• Average P13 latency was 13.97 ± 1.33 ms, N23 latency was 24.03 ± 1.79 ms, and amplitude was 66.89 ± 44.1 μV.

Conclusions:

• The chin-rest pressure feedback technique is a simple and effective method for standardizing SCM contraction during VEMP testing.
• It offers high test-retest reliability, facilitating consistent VEMP assessments.
• This method enables reliable VEMP comparisons across various clinical situations and over time.